# SourceMint

SourceMint is a wallet-native evidence API for autonomous agents. It uses x402 v2 payments in native USDC on Base mainnet. No account or API key is required.

## Products

- POST /api/extract — $0.001 USDC. Input: {"url":"https://..."}. Returns clean Markdown, citations, retrieval metadata, source SHA-256, and metrics.
- POST /api/verify-claim — $0.01 USDC. Input: {"claim":"...","urls":["https://..."]}. Returns ranked source passages, transparent consistency labels, source hashes, and a bundle hash.
- POST /api/audit-citations — $0.05 USDC. Input: {"answer":"...","urls":["https://..."]}. Returns sentence-level support coverage, best evidence passages, source hashes, and a tamper-evident audit hash.

## Integration

Fetch the free product catalog at https://sourcemint-api.nap6281.chatgpt.site/api/catalog to compare current prices, inputs, and purchase URLs.

Call the desired endpoint. An unpaid request returns HTTP 402 with a base64-encoded PAYMENT-REQUIRED header. Sign one accepted x402 v2 payment requirement and retry the identical request with PAYMENT-SIGNATURE. A successful paid response includes PAYMENT-RESPONSE.

OpenAPI: https://sourcemint-api.nap6281.chatgpt.site/openapi.json
x402 manifest: https://sourcemint-api.nap6281.chatgpt.site/.well-known/x402.json
Buyer quickstart: https://sourcemint-api.nap6281.chatgpt.site/quickstart
Sample results: https://sourcemint-api.nap6281.chatgpt.site/examples
Free fixed-input demo: POST https://sourcemint-api.nap6281.chatgpt.site/api/demo/audit-citations
Citation verification guide: https://sourcemint-api.nap6281.chatgpt.site/citation-verification-api
A2A agent card: https://sourcemint-api.nap6281.chatgpt.site/.well-known/agent-card.json
MCP server: https://sourcemint-api.nap6281.chatgpt.site/api/mcp (free product discovery, payment instructions, and fixed demo; no wallet custody)
MCP manifest: https://sourcemint-api.nap6281.chatgpt.site/.well-known/mcp.json
Health: https://sourcemint-api.nap6281.chatgpt.site/api/health

## Limitations

Only public HTTP(S) HTML pages are accepted. Each page is limited to 1 MB. Verification and auditing use transparent lexical evidence matching; scores are not guarantees of factual truth or source authority.